Machine for grooving lenses.



M. HANSEN.

MACHINE FOR GR OOVINGIENSES. APPLICATION FILED SEPT-2h IEHiiw 1,226,329. Patented May 15, 1917. L

3SHEETS-SIHEET IQ In vent br:

M. HANSEN. MACHINE FOR GROOVING LENSES.

APPLICATION FILED SEPT-27w I9l6.

Patented vMay 15, 1917-.

v Inventory Att st:

- the cutter. By that patent it was intended UNITED sTATns PATENT OFFICE.

l mnnus HANSEN, OF BROOKLYN, NEW YORK MACHINE FOB. GBOOVING LENSES.

Specification of Letters Patent.

Patented May 15, "1917.

Application fled September 27, 1916. Serial No. 122,334.

fication, reference being had to the accompanying drawings, forming a part hereof.

In United States Patent No. 1,1454%, issued tothe present applicant on July 6, 1915, there is shown and described a machine for grooving the edges of lenses in which the cutter is guided yieldingly along the edge of the lens and held at a fixed distance from thefaees thereof by adjustable means cooperating with the supporting franie for to cover, broadly, any devices for maintaining automatically the desired. relationship between .the cutter and the edge of the lens.

1 he present invention is concerned with a modified structure in which the same desired relationship between the cutter and the edge of the lens is maintained automatically by ad justhblc. means cooperating with the supporting frame of the lens. 'A further object of the invention is to provide devices coii erating with the supporting frame of the cutterto press the edge of the cutter yieldingl y into engagement. with the ed e of the'lens to be grooved. Still another 0 Jject is to provide. in association with the elements heretofore 'uoted,'suitable manually adplstablc means for setting the parts in the desired initial relatumslup and changing 'this relationship as may be necessary from time to time. Three illustrative embodirooms of the improved devices for accomplishing the (.lesi-red results in the general manner described are shown in the accompanying drawings, in whiclr Figure his a view in plan of a machine embodying the invention. I

Fig. 2 is a view in elevation of the machine shown in Fig. 1, parts being broken awav to show in detail the driving shaft for the lens.

Fig. 3 is a view in end elevation of the. 'umchmc shown in Figs. 1 and Fig. 4 is a fragmentary detail view in sect ion of one of the manual adjustments for the guiding devices. taken along the plane inrbcated by the line 4-4 of Fig. 3 and ldokiug in the direction of thc arrow.

of Norway, and a resi- Fig. 5 is a view in plan of a machine of somewhat modified form but embodying the invention intended to be covered by this application.

Fig; 6 is a view in side elevation of the machine shown in Fig. 5. i

Figs. 7, 8 and 9 are respectively a top view, a side elevation and a section on the plane indicated by the line 9 -9 of Fig. 7 of still another form of the machine.

The improved machine has a base a on which are supported fixed standards 1 in wvhich bear the supporting and driving devices for the lens c, as will appear hereinafter, and swinging standards (1 in which bear the supporting and driving elements for the rotary cutter c. As shown in Figs. 1 and 2, there is supported in the standards I) a generally U-shaped supporting frame or yoke, f on which are formed trunnions f which may be journaled in the said standards i such manner as to permit free lateral movement of the frame f bodily between the standards. In these trunnions f are supported-the sections g, h, of the driving shaft for the lens, and on one of these sections g may be carried a suitable drive pulley g, for the purpose of imparting rotation to the lens. The end of the other shaft section h may bear against a suitable bearing indicated as a ball i. and this hearing may be backed up by an adjustable set screw 1:

for the purpose ofinoving the shaft section k axially within the trunnions of the supporting fral'ne. The proximate ends of the shaft sections 9. h. may carry suitable frictional disks g 71.. respectively. between which the lens I; may be clamped readily by setting up on the thumb screw 7.: as will be evident. Axial motel-mat of the shaft sec tion {1 in its supporting trunnion j" is prevented'bymeans of'a bearing shown as balls l interposed between an annular shoulder g and a grooved race f in the yoke 7'. From the description thus far given, it will be evident that rotative movement may be imparted to the lens c'througl'i the pulley g in the usual manner. the supporting and operating elei'nents for the lens being all mounted in fixed relation with one another in the frame f. Lateral movement of this such parts. Normally, the supporting frame f is pulled toward one side or the other, as by means of a-suitable spring m anchored to the frame and to one of the supporting standards 6. In all lateral movement of the frame it is guided by any suitable devices shown herein as adjustable set,screws n, opposed to one another and carried fixedly on the base a, the ends of these screws nearly bearing on opposite faces of the frame so as to prevent a swinging movement thereof but, at the same time, permit a guided lateral. movement between such ends.

The rotating cutter. e, which may 'be of any suitable character, is shown as supported on a drive shaft 0 to which rotative movement may be imparted through a pulley 0.

This cutter may be secured on said shaft de-- the lens by means of a suitable spring 1 intel-posed operatiyely between one of the swinging standards (Z and the fixed standard 7) on the base plate. It is this spring which maintains the edge of the cutter constantly in yielding engagementiwith the edge of the lens and insures the uniform cutting of the groove along the edge regardless of the particular contour of the lens. Aside from this yielding engagement of the cutter with the edge of the lens it will be understood that it is of equal importance to have the edge of the cutter maintained constantly at a fixed distance from the faces of the lens, so that neither the cross-sectional nor peripheral contour of the lens can affect the grooving operation. It has been explained that the support for the lens 0 and its driving elements is slidable laterally in the fixed bearings b therefor under the influence of the spring m. By limiting the sliding movement of this support in one direction through the engagement of the face of. the lens or some associated element movable in unison therewith, it will be evident that the lateral movement of the support can be made proportional to the changing cross sectional contour of the lens and the cutter thereby maintained at a fixed distance from the faces. In the illustrated embodiment, there has been shown. an adjustable abutment, such as a set screw q mounted so that its end will engage one face of the lens and therelry limit the movement of the lens in one direction under the influence of the spr ng m. By listing the screw g it will pivoted to the swn'iging supporting standards d for the cutter e and its driving elements. It may be desirable to change the distance between the edge of the lens and the bearing point of the end of the adjustable abutment Q and for this purpose meanshave been provided to swing the screw Q laterally with its arm (l'. Such means comprise a set screw 0" carried on one of the supporting standards (Z and having its threaded shank engaged with a trunnion block a", the trunnion r on which rests in a slot (Z in one face of the supporting arm 1! for the'screw By manipulation of the screw 1' the supporting arm 7/ may be swung to or fro to swingthe bearing end of the screw q nearer to or farther away from the periphery of the lens to be grooved.

In operation the lens 0 is clamped in position between the frictioi-ial disks y", it, and its relation to the cutter e adjusted by means of the set screws 7* and 9' so that the cutter will be in proper relation to the faces of the lens. Rotative movement is then imparted to both the lensand the cutter through their drive pulleys y, 0'. During thegrooving operation the cutter will be maintainedat a fixed distance from the faces of the lens by means of the s 'ning m which constantly forces the supporting frame to the right, as viewed in Fig. 2, and thereby holds one face of the lens in constant engagement with the bearing end of the set screw (1. The cutter a is also pressed constantly against the edge of the lens yieldingly by the spring ,0, which serves to swing the supporting standards (Z for the cutter in toward the fixed standards I) for the lens. The supporting yoke for the lens is guided in its lateral movement between the abutments n, herein shown as set screws. In the present case, the invention resides in the provision of devices for moving the lens laterally to main tain its faces in fixed relation to the cutter at all times and in pressing the cutter yieldingly against the edge of the lens by means of the spring 7) in engagement with the swinging standards for the cutter. In the If the lens to be grooved is very. thin there is danger that the edge of the lens may be 120 machine shown in the patent hereinbefore chipped in applying the strap or, it might be, the usualspcctaclc frame, if it is grooved at that end. For the purpose tl'iereforc, of

avoiding the grooving of the lens at any particular partthere are provided means for sc 'iarat'mg the lens and the cutter at such part so as to prevent the action of the cutter on the lens. Such meansmay conveniently consist of a cam plate It, pref'en ably slotted so as to be adjustable and a mounted on the shaft h, adjacent to. the disk k','and so positioned as to strike the screw 9 at each rotation of the shaft and separate the cutter and lens for a portion of the roand at the end of the other of which is provided an end bearing 21 against which bears the setscrew k. The driving elements described are supported in a horizontally disosed, frame F at one end of which is a yoke through the arms of which extend the saidshort shaft sections, while at the other end of which is a pivot pin F" about which thejrameis permitted to have a free sw-inging movement in a=horizontal plane, For the support of the Marne I" there may be rovided, in addition to the main standarrl in which the pivot pin 1" bears, other bearing posts F 1, upon which rest suitable antifriction l'iearings F", as clearly shown.- frame I" by antifriction devices and m such I mannerthat it may swing laterally with .15

little retarc'lanme, may be provided without departing from the spirit of the Invention. Normally, the frame I is moved in one-d1- "rection yieldingly by means of a spring M,

one end of which is engaged with the frame ,[and the othcr'cnd of'whicl'i is secured to a fixed post M; Themovcn'ient ofthe frame under the influence of the spring M is limited, however, by means of an adjustable set screw 1', carried on'a fixed post 8', the

merely for convenience as during the time that the machine is inoperative. The cutter Supportxal in exactly the manner de" scribed with relation 'to Figs. 1A and its [swinging support d provision of this limiting abutment being swinging standards 'rl entry, as before, a

'ainstthe end of which bears one face e lens a; The position Qf the bea-rgg end dii'f this screw g with-relation to the g the lens a ma be adjustedmanually 1n the Other means for suj'iporting the for a set screw ig eofmanner hereinbefore described, as through the set screw '1' and trunnion block 1''. The edge of the cutter c is pressed yieldingly against the ed c of the lens to be grooved by means of t e spring 1 interposed convenientl between one of the swinging stander cl for the cutter and one of the bearin posts F for the swinging frame F.-

In t is form of the invention'the principle of adjustment, both automatic and marmal, descrlbedin connection with the-machine shown in Figs. 14, is retained in full, and the desired relationship between the cutter and the edge of the lens is preserved, as before, through lateral movement of the lens with relation tothe cutter and through the yielding engagement of the cutter with the edge of the lens as under the influence of the spring 77 on the swinging starulards d. \\hen the frame F is swung laterally under the influence of the spring M only the engagement of one face of the lens I; with the bearing end of the set screw 4' will limit this movement and since the stress of the spring M- is eonstant, this engagement will be preserved throughout the cutting operation and the cutter maintainedautomatically at the desired distance from the faces of the lens; In Figs. 7, 8 and 9 shown a machine which resemblesthe machine of the Patent No. 1,145,194, in that the cutter is movable laterally to conform to the edge of the lens, but embodies also some of the-featu res of the present invention and illustrates obvious substitutes for some of the devices (fillll'lltlycd.

In this machine, the shaft sections g, It are mounted in fixed bearings, and the sl'iaft g,"

'which is immovable longitudinally, carries the driving pulley g, the friction disk and the cam plate it", for effecting separation of the lens and the cutter at any desired point. The shaft 0, which carries the driving pulley o, the cutterc and the ad 'justable abutment screw (1, which cooperates with the face of the lenslai'nd with which "the cam plate .h" cooperates, is mounted both to rotate and to have longitudinal movement ina l'iorizontally swingingframe rl" which is pivoted at (1, on a suitable'stamlard d, and rests, near the cutter, upon a'sta'ndard rl" provided with a guide arm 11. a A weight ll" is con'nectcdnby a cord (1" to the arm or frame fl? and misses over a guide pulley n this arrangement being a substitute for the spring 7) as a means to press the cutter yicldingly toward the edge-of the lens. The weight acts with a more uniform pressure than the spring, can be more accurately adterioration. In like manner the pressure which holds the almtmentscrew 4 against thefaec of the lens may be furnished by a weight. As-clearly shoivn in Figs. 7 and 8, a bell eranli lever 11, pivoted on the standa rd d", has one arm bearing against the end ins-ted, and is less liable to injury and dcof the shaft 0 and the other arm provided with a weight (Z As noted hereinbefore, the desired grooving Operation may be carriedon in a ma chine in which the details of construction of the various elements and their relative disposition are changed somewhat, the three emliiodiments shown herein being intended merely as illustrative of the somewhat different principle of adjustment shownin this case from that shown specifically in the patent referred to. 'WVhile that patent covers, broadly, the automatic maintenance of the desired relation between the edge of the cutter and the edge andfaces of the lens, it does not disclose specifically means of the character herein shown for performing the desired functions. Accordingly, it is the province ofthisapplication to cover in a somewhat limited manner devices, operable on the principle herein emphasized, for maintaining the stated relation between the lens and the cutter. Reference is to be had to the appended claims for a clear definition of the scope of the invention.

I claim as my invention;

1. A machine for grooving lenses comprising a movable supporting framein which the lens is rotatably mounted, a rotary .cutter, a fixed abutment to limit the movement of the lens in one direction with relation to the face of the cutter and means cooperating with the frame for automatically maintaining the lens in the termined by the abutment. I

2..A machine for grooving lenses comprising a movable supporting frame .in which the lens is rotatably mounted, a ro-. tary cutter, a fixed. abutment to limit the movement of the lens in one direction with relation to the face of the cutter, anda spring cooperating with the frame for holdposition de ing the frame yieldingly in the said position determined b the abutment.

3. A machine for grooving lenses comprising a movable supporting frame in which the lens is rotatably mounted, a rotar'ycutter, afixed'abutment to limit the movement ofthe lens in one direction with relation to the face of the cutter, means cooperating with the frame .for holding the frame yieldingly in the said position determined by the abutment and means to hold the edge of the cutter and the edge of the lens in yielding operative engagement.

4. A machine for grooving lenses comprising a movable supporting frame in which the lens is rotatably mounted, a rotary cutter, an adjustable arm in fixed relation to the cutterand having an abutment to engage the face of the-lens to position the cutting edge with respect thereto and means in operative engagement with the framev to move the same laterally and hold the face of the lens yicldingly against the abutment.

@A machine for grooving lenses comprlsing a movable supporting frame in which the lens is rotatably mounted, a 1'0- tary cutter, an adj usta-blearm in fixed relation to the cutter and having an abutment to engage the face of the lens to position the cutting edge with respect thereto, means in operatlve engagement with the frame to move the same laterally and hold the face of the lens yicldingly against the arm, and

means to adjust the said arm-t0 vary the i point of bearing of the" abutment against thethe edge of the lens in yielding, operative engagement.

7. A machine for grooving lenses comprising a movable supporting frame in which the lens is rotatably mounted,.a rotary cutter, a swinging supporting. frame for the cutter, anadjustable screw carried with the swinging frame of th-cutter and engaging the face of the lens to position the cutting edge with respect thereto and-meansin operative engagement with the frame to move'the same laterally and hold the face of the lens yieldingly against the end of the 8. A machine for grooving lenses com-v prising a movable supporting frame in whichthe lens is rotatabl mounted, a rotary cutter an arm pivota ly carried on the frame of thec'utter, an adjustableiscrew.car

ried in said arm and adapted to engage the face of the lens to position the cutting edge with. respect'thereto, means in operative engagement "with the frame for the lens to move the same laterally and hold the-face of the lens yieldingly against the end of the i screw and a separate adjusting screw carried with the. frame of the cutter and engaging the supporting arm; for the first named screw to vary. the point of bearing of the screw against the face of the lens.

9. A machine for groovinglenses comprising a movable supporting frame in which the lens is rotatably mounted, supportingstandards in which the frame is journaled, a driving shaft for the lens car-- ried in the frame and comprising two sections, an adjusting screw bearing against the end of one of said sections to adjust the shaft in the frame, a rotary cutter, a fixed abutment to limit the movement of the lens in one direction With'r'e'liation to the face of the cutter, and means cooperating With the frame for holding the frame yieldingly in the positiondetermined by the abutment,

the driving shaft for the lens being movable with the frame in its supporting standards.

10. In a machine for grooving lenses, a cutter, a U-shaped supporting frame for the lens having laterally extending trunnions Standards in which said trunnions are journaled, a sectional drive shaft for the lens journaled adjustably in the trunnions and means to move the frame laterally in its standards with the drive shaft to adjust it with relation to the cutter.-

11. A machine for grooving lenses comprising means for supporting and rotating the lens, means for supporting and rotating the cutter, one of said supporting means being movable with respect to the other to 381- niit the cutter to bear against the edge 0 the lens, and a cam plate mounted to rotate with the lens and to cooperate with the cutter supporting means to separate the cutter and the lens at a determined. point in the edge of the latter. i

This specification signed this 20th day of Sept, A. D. 1916.

MARINIUS HANSEN. 

